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Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract:
Globular clusters are old stellar systems which exhibit very-high stellar
densities in their cores. The globular cluster Terzan 5 is characterized by a
high stellar encounter rate and hosts the largest detected population of
millisecond pulsars. It also features bright GeV gamma-ray emission and
extended X-ray radiation. However, no globular clusters have been detected in
very-high-energy gamma rays (VHE, E> 100 GeV) so far. In order to investigate
this possibility Terzan 5 has been observed with the H.E.S.S. telescope array
in this energy band. The discovery of a source of VHE gamma rays from the
direction of this globular cluster will be reported. The results of the VHE
analysis and a multi-wavelength view of Terzan 5 will be presented in this
contribution. No counterpart or model can fully explain the observed morphology
of the detected VHE gamma-ray source.
